Sankhya: The Indian Journal of Statistics

2001, Volume 63, Series B, Pt. 2, pp. 199--217

WAVELET PACKET MODELLING OF INFANT SLEEP STATE USING HEART RATE DATA

By

GUY P. NASON University of Bristol, England
THEOFANIS SAPATINAS, University of Cyprus, Cyprus

and

ANDREW SAWCZENKO, Instute of Child Health, Bristol, England

SUMMARY. We show how a recently developed wavelet packet modelling methodology could be useful for infant sleep state classification using heart rate data. The suggested approach produces adequate classification rates when applied to recordings taken at different ages from an infant who was put to bed at night. As well as classification, this approach gives us valuable information about the relationship between sleep state and heart rate. The statistical model tells us which sorts of wavelet packets of heart rate are most important for classifying sleep state.

AMS (1991) subject classification. 62M10.

Key words and phrases. Antedependence models; infant sleep state classification; linear discriminant analysis; variable selection; wavelets; wavelet packets

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